Re: Overdrive Transmission in a 1952 F1
It boils down the movement in service and the ability to disengage the rear U-joint from the drive flange on the differential. If a person has to fab up a drive shaft, I'd go for the best possible engagement with spline with 3/4" to 1" of total slip without bottoming out. 1 3/4" to 2" of engagement should work but I'd look for as much as I could get and still be safe.
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